Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp

Index: src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
diff --git a/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp b/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6a04d4f38792892166a2a153a86c09d01ae2a5c2
--- /dev/null
+++ b/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gl/GrGLAssembleInterface.h"
+#include "../GrGLUtil.h"
+
+#include "osmesa_wrapper.h"
+
+static GrGLFuncPtr osmesa_get(void* ctx, const char name[]) {
+    SkASSERT(nullptr == ctx);
+    SkASSERT(OSMesaGetCurrentContext());
+    return OSMesaGetProcAddress(name);
+}
+
+const GrGLInterface* GrGLCreateMesaInterface() {
+    if (nullptr == OSMesaGetCurrentContext()) {
+        return nullptr;
+    }
+    return GrGLAssembleInterface(nullptr, osmesa_get);
+}